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advertisement albumen Answers Article benzole bichromate burnt camera extension cement cheaper collodion colour printing competition competitor continuous tone copper cost craft darker tone develop dragon's blood drying the plate duction effect embossing enamel Esparto etching expose exposure FARRINGDON Federal Trade Commission FEDERATION filter FISH GLUE forms the resist give gravure gravure printing half-tone block half-tone colour illustration industry ink image Kingsway Kodak Kodaline letterpress printing lighter tones line negative London Manufactured menace method Mounting plates mounting press Nitric acid offset plate offset press Offset printing ordinary original copy perfect photographic photogravure plate mounting possible Potassium pressroom printing colours printing machine process block Process Photogram produced readers repro result round dots round high light round stop screen distance shellac Silver Nitrate solution specimens square or round Tenak tion tone process usual wash in running Water 20 oz Wratten ZINC